Long-acting fragrance-retaining essence microcapsule and preparation method thereof

The invention relates to the technical field of essences, in particular to a long-acting fragrance-retaining essence microcapsule and a preparation method thereof, the long-acting fragrance-retaining essence microcapsule comprises the following raw materials in parts by weight: an oil phase: 10-34 parts of oily essence and 0.5-1 part of diisocyanate compound; and the water phase comprises the following components in parts by weight: 1-17 parts of an emulsifier, 1-3 parts of a compound with diamine or diol, 2-4.5 parts of a prepolymer, 3-6 parts of a formaldehyde catching agent and 44.6-84 parts of deionized water. The essence microcapsule is formed by coating the oily essence in a double-layer mode, double-layer protection is carried out on the volatile oily essence, the fragrance retention time of the essence is greatly prolonged, on the other hand, the physical state of the essence is changed, and under the action of external force friction or pressure, the fragrance of the essence can be effectively releas